APRILAIRE 8120X (01) PDF Document

WARNING

120 volts can cause serious injury from electric shock. Disconnect electrical power to the HVAC system before proceeding.

Sharp metal edges can cause serious injury from cuts. Use gloves when cutting openings in sheet metal.

NOTICE

When installing the Ventilation Controller on downflow furnaces, ensure that the furnace blower continues to run sufficiently long after the heat call is satisfied to prevent temperatures from exceeding the maximum operating temperature.

Do not mount the Ventilation Controller downstream from any fresh air intake port, humidifier bypass or zone control bypass. False humidity conditions will cause the Ventilation Controller to operate incorrectly.

Note: In hot/humid climates where limiting ventilation with high indoor RH is important, mount the control to the return duct and mount the outdoor temperature sensor separately. If humidity limits will not be used, then the control can be mounted to the housing of the Model 8140NC and the outdoor temperature sensor does not need to be installed:

1. Remove the wall plate from the control and put the rest of the control in a safe location until after wiring is completed.

2. Remove the sensor hole plug from the cover of the Model 8140NC.

3. Use the supplied #8 x 1/2″ hex head sheet metal screws to mount the wall plate to the cover of the Model 8140NC.

Note: Mount the controller to the return ductwork at a location where the temperature and humidity in the duct is most representative of the home. Keep the controller at least 6″ upstream from the point where the fresh air duct enters the return duct, and 6″ upstream from a humidifier outlet.

1. Remove the wall plate from the control and put the rest of the control in a safe location until after wiring is completed.

2. Mark the location of the wall plate sensor hole on the duct. Use a step-drill bit to create a 5/8″ (.625″) hole for the sensor.

3. Center the sensor hole in the wall plate over the hole in the duct, level the wall plate and mark the locations of the two mounting slots. Drill a small pilot hole using a #36 (.106″) or smaller drill bit at the two mounting locations.

4. Use the supplied #8 standard hex head sheet metal screws to mount the wall plate to the duct.

1. Take out the duct board mounting bracket, remove the wall plate from the control and put the rest of the control in a safe location until after wiring is completed.

2. Cut a 5.75″ x 5.25″ rectangular opening in the return plenum. Save the piece cut out to insulate the duct board bracket around the controller. The display of the control will run parallel with the long dimension. DO NOT MOUNT THE CONTROL IN A POSITION WHERE IT IS FACING DOWN.

3. Use the supplied #8 x 1/2″ type 25 pan head screws to mount the control wall plate to the duct board mounting bracket.

4. Place the bracket in the cut out and seal in place using metal foil tape and/or mastic.

5. Insulate the duct board bracket around the wall plate using the plug cut out of the duct board.

1. Drill a 3/8″ diameter hole in the duct of the fresh air inlet hood.

2. Install the outdoor temperature sensor into the duct and use metal foil tap to secure it in place and seal the opening. Run the wire toward the outside wall.

3. Secure ductwork to the inlet hood duct while allowing the wire of the sensor to extend outside of the insulation. Tape and/or mastic the duct as needed and properly insulate.

Disconnect power to the HVAC system to prevent electrical shorts while wiring.

1. Run a 2-conductor cable from the control to the outdoor temperature sensor (if installed) and wire to the controller ODT terminals.

2. Run an 8-conductor thermostat cable from the control to the HVAC equipment. Wire the controller to the HVAC equipment. Contact customer service if wiring assistance is needed for other equipment configurations.

3. Run a 2-conductor cable from the control to either the damper in Model 8126X installations or to the Model 8140NC Fresh Air Ventilator.

4. Route the wires into the channels in the back of the control to either the top or bottom of the control and snap the control onto the wall plate.

5. Restore power to the HVAC system when complete.

Hold the Up and Down buttons simultaneously for 5 seconds, then release to enter the Set Up Menu. Throughout the Set Up Menu, the Up and Down buttons are used to change values, and the Select button is used to enter the value and move on to the next Set Up Menu item.

Before setting up the control for use, the amount of ventilation air being delivered (CFM) by the installed ventilation system must be measured.

When all Set Up Menu options have been entered, the control will display donE.

To verify the ventilation time setting, press the Select button to scroll through the calculated Required Continuous CFM and the Measured CFM for this installation. If any value does not match the expected value, the Set Up Menu must be entered to change the floor area, number of bedrooms or measured cfm.

After wiring and set up have been completed, Test Mode can be used to verify that all components in the ventilation system function and that wiring to the HVAC system fan is correct.

1. Hold the Up and Down buttons simultaneously for 5 seconds.

2. Select “tESt” using the buttons.

Test Sequence:

1. The display shows the outdoor temperature as measured by the sensor wired to the ODT terminals. If “- – – – °F” shows, no outdoor temperature has been installed.

2. “tESt” shows on the display, the green Fresh Air LED will light and either the damper will open or the power ventilator will turn on depending on what has been wired to the VENT terminals.

3. After 15 seconds, the HVAC fan will turn on if it has been wired and set up to do so. The display will show “FAN” along with “tESt”.

4. After 45 seconds Test Mode automatically completes and the display returns to the operating display.

The control will turn on ventilation with a heating, cooling or fan call for the set number of minutes during a one-hour cycle period. If the outdoor temperature is above the high temperature ventilation limit, ventilation will not occur with a cool or fan call, but if it is below the low temperature ventilation limit it will occur with a heat call. If the HVAC equipment does not turn on enough to meet the ventilation time within the hour, the control will turn on ventilation without a call, if the outdoor air temperature is within the high and low ventilation temperature limits. The control will also turn on the HVAC system blower, if wired and set up to do so.

If the outdoor temperature exceeds the limits set at the end of the first hour, then no additional ventilation will occur for another 60 minutes, and the cycle period will automatically adjust to four hours. When the ventilator starts again, it will sample the air temperature and if in range, will meet the set amount of ventilation during the four-hour cycle period.

If the air temperature is still out of range, the control will automatically switch to an 8-hour cycle period, then a 12-hour cycle period and finally a 24-hour cycle period. During 8, 12 and 24 hour cycle periods, the total ventilation time increases to compensate for ventilation effectiveness as defined in ASHRAE Standard 62.2-2010. When the cycle period automatically adjusts to 24-hours, the control will turn on ventilation to meet the requirements even if the temperature is outside of the set limits.

The control will turn on ventilation with a heating, cooling or fan call by the HVAC equipment, if the outdoor air temperature is within the high and low ventilation temperature limits and the indoor RH is within the high and low RH limits, for the set number of minutes during a one-hour cycle period.

If the HVAC equipment does not turn on enough to meet the ventilation time within the hour, the control will turn on ventilation without a call, if the outdoor air temperature and indoor RH is within the set limits. The control will also turn on the HVAC system blower, if wired and set up to do so.

If the outdoor temperature or indoor RH are outside of the set limits, then no ventilation will occur.

The display will appear faint normally; the first press of any button will turn on the display at full power.

Display: Shows the ventilation time setting (minutes/hr), mode of operation (Code or Comfort) and whether the HVAC fan has been turned on when ventilating.

Up and Down Buttons: Use for Rater/Inspector Verification. Press and hold for 5 seconds to enter Test Mode or Set Up Menu.

Select Button: Use to override the calculated ventilation time (6 – 60 minutes/hr). Press and hold the “Down” button to turn ventilation OFF. To return to the calculated setting, go completely through the Set Up Menu.

Fresh Air LED: Lights green when ventilating.